Improvement in grates



E. S. RENWICK.

G rate.

Patented Feb. 23, 1869.

f .M .m/ @an @ttl-liteit ite. t t3* EDWARD SABINE RENWICK, or NEW YORK, N. Y.

Letters Patent No. 87,112,

dated Februar/ry 23, 1869. Y

IMPROVEMENT IN GRATES.

*M0-, The Schedule referred to in these Letters Patent andvmak-Ing part of the Ilma.

To all whom fit mtl/y concern:

Bel it known that I, EDWARD SABINE RENWIGK, of the city, county, and State of New York, have invented certain new and useful Improvements in Grates for Furnaces, Stoves, and other Apparatus for Burning Fuel; and that the following is a full, clear, and exact description and specification of my said invention,

The objects of the invention which constitutes .the subject-matter of this patent, are to enable a round grate to be cleansed of ashes and of clinkerwith greater facility than heretofore. To this end, i

The first part of my invention consists of the combination of one or more stationary circular grate-bars with one or more othergrate-hars, movable in a circular' direction', the whole constructed and operating in such manner that the movable bar or bars can be turned or vibrated upon the' vertical axis of the grate, or thereabout, while theother bar or bars do'not move with them; hence, when the movable bars are turned or vibrated horizontally, the coals lying upon them are also moved, while the stationary bars support a parttof/ the weight of the tire, and also, by iet'arding the Inoveinent of those parts of the coals which rest upon them, cause the coals to turn, or oscillate under the'action of the movable bar or bars.

My invention consists, further, of the combination of the iixed circular bar or bars, and the movable cir-1 cular bar or bars, (turning on a vertical axis,) witlia horizontal rock-shaft, or journals, so that the grate may? be tipped to discharge the contents of the 'lire-box.

My invention consists, further, ofthe combination of a grate arranged to tipon a horizontal axis, crossing it diametrically, or thereabout, with a tire-box, or pot,- that is curved at one side concentrically, or thereabout, with the tipping-axis, so that when the grate is partly tipped, to permit cinders to be drawn out at the depressed side of the grate, cinders are not permitted to jam in at the rising side oi the grate, and consequently the restoration of' the grate to a horizontal position is not obstructed materially by snc-h cindcrs or clinker.

Jn order that my invention may befully understood, I have represented, 'V1 the acconipanying drawings, one of the modes in which all parts of the invention may be embodied in a practical form.

Figure 1 represents a horizontal section of the tire-pot of a hot-air furnace, with the invention applied thereto;

'Figure 2 represents a vertical transverse section of it, crosswise to the tipping-axis of the grate; andY Figure 3 represents a similar section of it, through the tipping-axis of the grate.

.The drawings represent only such parts of a furnace as are necessary to enable the invention to be understood, the residue being constructed in any suitable manner.

The tire-pot, or box A, is of circular form, and the grate is composed of two parts or sets of grate-bars, both circular, and concentric with the axis of the repot.

One set of the grate-bars c c is prevented from turn- Y ing in a horizontal plane, by being secured to a rockd d, which are sustained in suitable bearings sustained by the walls of theash-pit of the furnace; hence, the whole grate may be tipped upon the axis of said journals as a tipping-axis, the front side of the grate .being depressed, and the rear side rising, for the discharging the contents of the tire-pot. I

In order to prevent the grate from being tipped in walLof-th'e ash-pit, beneath the rear side of the grate, "aid in practice, I prefer to arrange the tipping-axis a thereof, so that the preponderance of weight at the rear of the tipping-'axis will prevent the accidental tipping of the grate. i

In stoves and furnaces constructed heretofore with tipping-grates, (so far as I am aware,) the tire-pot is either cylindrical` above the grate, or 'graduallywidens; hence, when tue grate is tipped, the space s, 'between the rising side ofthe grate and the adjacent side of the, fire-pot, grows wider as the grate rises at that side, and, as a natural consequeice, coals or pieces of clinker that wouldnot pass through the space s when the grate is horizontal, can get into that space when the grate is partly turned up. In practice, such pieces do get into the space when the grate is turned up, and they obhorizontal position. i l

lo obviate this diflicnlty, I contract the side of .the {irc-pot, at 1', adjacent to the ,rising-side of the grate, making it, by preference, concentric, or thereabout, with the tipping-axis ot" the grate; hence, when the grate rises at that side, by the act of tipping, the space s does not increase in Width, and consequently no pieces of coals or other materialcan pass into that space, which will not pass through it when the grate is restored to a horizontal position.

This construction facilitates the removal of clinkers without discharging all the contents of the fire-pot, because the grate may be partly tipped so as to 'open the tire-pot at the front, to permit the clinkers to bedrawn out, and afterward, (as jamming at the rear side of the grate is prevented) the grate maybe readily restored to its horizontal position.

In practice, I prefer to cast all the parts of the movable part ofthe grate in one piece, and toV secure the members of the stationary part to each other by lugs or by screws. (See Figure 4.)

The rock-shaft B terminates at its ends in journals purpose of the wrong direction, a guard, f,'is secured to the'rear`V little nearer the front of the grate than the rear side struct or prevent the restoration of the grate to a' its axis parallel thereto, and the link may extend through a hole in the front of the ash-pit, from an arm of the rock-shaft to a lug projecting from the movable part of the"grate, in the vicinity of the rock-shaft B.

The rockfshaft, at the front of the casing, is then provided with a shaking-lever.

The eiiciency of the apparatus may be increased by forming the upper surface of the movable bars with projections.

I am aware that circular grates have been made to tip upon a horizontal axis, long prior to my invention, and that the entire grate has been constructed to turn or vibrate altogether upon a vertical axis, as well as to tip upon ahorizontal axis. I do not, therefore, claim such constructions; but

What I claim as my invention, and desire to secure by Letters Patent, isy The construction of the circular grate of two' parts, one of which is constructed to move in a circular direction relatively to the other, the two parts being so combined, that the movable part can be turned upon an axis which is perpendicular to the plane of the grate, substantially as/before set forth.

Also, the combination of the ixed and movable parts of the circular grate, (the latter constructed to turn, relatively to the former, upon an axis that is perpendicular to the plane of the grate,) with horizontal journals, on which the grate may be tipped, substantially as before set forth.

Also, the combination of the grate, constructed to tip upon a horizontal axis crossing it diametrically, with a fire-pot, curved at one side of the grate, concentrically with the tipping-axis of the grate, substantially as before set forth.

In testimony whereof, l have hereto set my hand, this 5th day of December, A. D. 1868.

E. S. RENWIOK.

Witnesses:

W. L. BENNEM, PHILIP OREILLY. 

